nd6_lookup prints bogus messages with point to point devices

[Ed Schouten]

Hello FreeBSD network folks,

On one of the FreeBSD machines we maintain at Dispuut Interlink[1], we
get a lot of messages like these:

| nd6_lookup: failed to add route for a neighbor(<ipv6-addr>), errno=17

The addresses mentioned in the messages are all addresses of endpoint
addresses of point-to-point devices. The nd6_lookup() call in the
function nd6_output() is responsible for it. If you look through
nd6_output(), you see that a couple of lines below the nd6_lookup() call
it doesn't really care when dealing with IFF_POINTOPOINT devices.

It would be really useful to drop the messages when dealing with point
to point devices, so I write a patch[2] for nd6_lookup() to make it
print the message when not dealing with IFF_POINTOPOINT devices.

Should I open a PR for this patch?

Yours,
-- 
 Ed Schouten <ed at fxq.nl>
 WWW: http://g-rave.nl/

[1] http://www.il.fontys.nl/
[2] http://g-rave.nl/junk/freebsd-nd6_lookup-spam.diff
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